Get rid of NVIDIA's Network Manager. I've been pulling my hair out for over two weeks trying to get my new PC connected to the internet via router, and I tried everything. I flashed a new BIOS, disabled the NVIDIA and Windows firewalls, fiddled with every setting I could find dealing with network or internet connectivity, and uninstalled and re-installed damn near every driver in my machine. So, just so someone else doesn't overlook the obvious as I did, get rid of the NVIDIA Network Manager. And I had to use DriverCleaner in safe mode to get rid of all of it. Then I reinstalled the NVIDIA mobo drivers without the firewall and network manager. Now, finally, I can connect.